Raspberry Pi is a small credit card sized computer, It is very cheap compared to the traditional computers, the Raspberry Pi Foundation has arrangements with a few manufacturers from whom you can buy a Pi directly at $25 - $35.
The Raspberry Pi unlike the traditional computer, it has the ability to integrate with electronics projects. Raspberry Pi to control devices that a microcontroller can control like LEDs, relays, LCDs etc. A Raspberry Pi is better used where more processing power and connectivity is needed like for exemple when you want to remotely access a temperature sensor via the web to change its settings and download temperature log files and more in general Internet of Things (IoT) and Home Automation applications you should consider using the Raspberry Pi.

Arduino shields are boards that can be plugged on top of the Arduino PCB to extend its capabilities. This makes prototyping with Arduino plug and play. Instead of soldering or wiring external devices or sensors, you can simply hook your board with a shield. This speeds up development time even for absolute beginners.
This is a practical tutorial, we're gonna build a fully working complete Arduino Relay shield, we're gonna go through all the steps

The ESP8266 is a wonder WiFi module that can literally give any microcontroller access to WiFi network and thus enabling countless Internet of Things (IoT) and Home Automation applications at a fraction of cost compared to the alternative options.
It's easy to use, it's popular, it has stormed the world of makers in recent years since 2014, you can now build your own cool electronic application that communicates to the internet and can be accessed from anywhere in the world

Ethernet is the leading wired standard for networking as it enables to connect a very large number of computers, microcontrollers and other computer-based equipment to one another.
In this project we are going to learn how to control any device like an LED, a relay, a light bulb, a motor and so on connected to a PIC Microcontroller from a remote location using just a web browser. An operator can use a computer, tablet or even a cellphone to control a device at a remote location. With the help of a router connected to the internet, this device can be controlled anywhere from the world in real time.
Connecting to a Microcontroller using a web browser is the easiest and reliable method of establishing connectivity and above all there is no need to develop a special Graphical User Interface software on the PC or cellphone for that matter as all PCs' operating systems already have a built-in web browser or one can download one of the free other web browsers like Google chrome or Mozilla Firefox for example.

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